<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <!-- 
        添加多张背景图用逗号隔开
            先添加的优先显示
     -->
    <style>
        div{
            width: 400px; height: 400px;
            background: url(images/flower-red.png) no-repeat center,url(images/sky.jpg) no-repeat;
        }
    </style>
</head>
<body>
    <div></div>
</body>
</html>